US5089908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plywood suppression in ROS systems
Assignee: Xerox Corp
•
Filing: 1991-07-26
•
Granted: 1992-02-18
•
Expires: 2011-07-26
Abstract
Abstract A multiple diode laser array used in a ROS scanning system is modified to reduce the effects of undesirable spatial exposure variation at the surface of certain type of layered, semi-transparent photoreceptors. The spatial absorption variation is later manifested as a "plywooding" pattern formed on output prints derived from the exposed photoreceptor. The laser array is modified to form a merged scanning beam at the photoreceptor surface of two or more diode outputs, each output operating at a different wavelength than the other. In one embodiment, a plurality of diodes, each at a different wavelength, are sequentially addressed, and an image of each diode is scanned across the photoreceptor which results in an exposure distribution that would be similar to that formed by an incoherent beam.
Inventors
- 👤 Ronald E. Jodoin
- 👤 Robert P. Loce
- 👤 William L. Lama
- 👤 James D. Rees
- 👤 Abd-El-Fattah A. Ibrahim
- 👤 James J. Appel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:39
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/123; H; H04; H04N; H04N1/00; H04N1/23; H04N1/29
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
A light scanning system comprising: a photosensitive image recording member comprising at least a transparent photoconductive charge transport layer overlying a charge generator layer and a conductive ground plane, a diode laser array including a plurality of diodes, each diode operating at a different output wavelength, means for supplying video signal information to said diodes to provide for emission of a plurality of light beams from said array with each of said light beams being modulated in accordance with said video signal information and at said different output wavelengths, optical means for focusing said plurality of light beams to form a merged beam at the surface of said recording member, and scanning means for scanning said merged beam across a linear portion of said image recording member surface, wherein the portion of the beam transmitted through the recording member and reflected from the ground plane back to the surface results in minimal spatial exposure variation at the surface due to the different absorption rates of the beam passing through the charge generator layer.
Claim 2
Dependent Claim
173 words
A light scanning system comprising: a photosensitive image recording member comprising at least a transparent photoconductive charge transport layer overlying a charge generator layer and a conductive ground plane, a diode laser array including a plurality of diodes, each diode operating at a different output wavelength, means for supplying video signal information to said diodes to provide for emission of a plurality of light beams from said array with each of said light beams being modulated in accordance with said video signal information and at said different output wavelengths, optical means for focusing said plurality of light beams to form a merged beam at the surface of said recording member, and scanning means for scanning said merged beam across a linear portion of said image recording member surface, wherein the portion of the beam transmitted through the recording member and reflected from the ground plane back to the surface results in minimal spatial exposure variation at the surface due to the different absorption rates of the beam passing through the charge generator layer.
Claim 3
Dependent Claim
30 words
The light scanning system of claim 1, wherein said laser array includes two diodes each operating at a wavelength whose absorptance modulation through said transport layer effectively cancel each other.
Claim 4
Dependent Claim
37 words
The light scanning system of claim 1, wherein said plurality of diodes are individually and sequentially addressed during each scan operation with each diode forming images at the image surface at the same location for each scan.
Claim 5
Dependent Claim
22 words
The light scanning system of claim 1, wherein said diodes are adapted to form multiple scan lines at the recording member surface.
References Cited (Backward Citations)
US4157215A
Cited
US4253102A
Cited
US4420761A
Cited
US4445125A
Cited
US4618552A
Cited
US4588667A
Cited
US4725131A
Cited
US4796964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |